The Redmine Arch Decisions plugin can be used to track technical decisions (architecture, or "arch" decisions) made as part of a project. It encourages collaboration by the whole team, helps make assumptions and rationale explicit, and helps keep track of which options are being or have been considered. For a more in-depth discussion of the benefits and features of this plugin, see: http://timhigh.wordpress.com/2010/02/23/announcing-the-arch-decisions-plugin-for-redmine/

This plugin was originally made for Redmine 0.8.4, and up through release 0.0.8 it is best used with that version. As of release 0.0.9, the "master" branch is certified for use with Redmine 0.9.2 (and is probably not compatible with 0.8.x). A separate branch ("redmine-0.8.4") has been created for those that wish to use that version. No promises are being made as to whether or notnew functionality will be merged to this branch, although bug fixes will for the time being be supported.

After you have completed the installation of the plugin you can select which projects will actually be able to use the feature brought by the plugin by activating the plugin's module in the "project settings":

In the preferred Redmine project, go to the "Project settings":

On the "Modules" tab: enable the plugin-module by checking "Arch Decisions".

After that, two new tabs named "Arch Decisions" and "Factors" will show up in the project menu.

You also must configure permissions for users to be able to see, create and modify Arch Decisions and Factors.